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Writers on nervous diseases, as a rule, devote considerable attention to migraine, its etiology and clinical phases. It is generally conceded that it is due to some special sources of irritation, whether in the stomach, uterus, eye or elsewhere in the system. The eye is often honored as a causative factor with the appropriate heading of "Ophthalmic Migraine." Physicians and scientists have recorded minutely and accurately, attacks occuring in their own persons. Among these, Wollaston stands preëminent as the first who drew general attention to one phase of this functional disturbance, viz.: temporary hemianopsia. A dissertation on the "Semi-Decussation of the Optic Nerves" was published by him in the "Philosophical Transactions" a few years prior to his death, which took place in 1806, from organic disease of the brain. In this paper he stoutly affirmed his belief in the semi-decussation of the nerves at the optic chiasm. He arrived at